Let’s say the Metro parking lot you arrive at Monday morning is full. Tweet it, including your location and #WTOP in your under-140 character Twitter message.

After you launch the Twitter app on your phone, your tweet might look like this:

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That way, anyone using Twitter who searches #WTOP will find your helpful heads-up, and choose another parking lot.

The WTOP newsroom also will be monitoring #WTOP, so your tweet can be integrated into WTOP’s on-air and online coverage.

Here’s another scenario: let’s say when you get downtown you come across a vendor dressed as Abraham Lincoln.

Since a picture is worth a thousand words, snap one, and include it in your tweet. Once you download your mobile Twitter app, you’ll see how to easily attach a photo. And don’t forget to use #WTOP in your tweet.

Here’s how to be a part of our coverage on Facebook:

Launch the Facebook app on your phone, and search for the WTOP Radio page.

Under each story is a Comment option, click on that, and type in your observation or thoughts.

You can send your information and pictures to webmail@wtop.com. The downside of that is only we in the newsroom can see what you send, unlike with Twitter and Facebook, in which you’re helping others real-time.